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SbA750 User Manual
Electro-Voice®
SbA750 User Manual
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Important Safety Instructions
The lightning flash with arrowhead symbol, within an equilateral triangle
is intended to alert the user to the presence of uninsulated dangerous
voltage within the products enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert
the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water. Do not expose this apparatus to dripping or splashing and ensure that no objects filled
with liquids, such as vases, are placed on this apparatus.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install in accordance with the manufacturers instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers)
that produce heat.
9. Only use attachments/accessories specified by the manufacturer.
10. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
11.To completely disconnect AC power from this apparatus, the power supply cord must be unplugged.
For US and CANADA only:
Do not defeat the safety purpose of the grounding-type plug. A grounding type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. When the provided plug does not fit into your outlet, consult an
electrican for replacement of the absolete outlet.
Important Service Instructions
CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do
not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer
all servicing to qualified service personnel.
1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when
servicing the appliance.
2. Use of a AC separator transformer is mandatory during maintenance while the appliance is opened, needs to be
operated and is connected to the AC.
3. Switch off the power before retrofitting any extensions, changing the AC voltage or the output voltage.
4. The minimum distance between parts carrying AC voltage and any accessible metal piece (metal enclosure),
respectively between the AC poles has to be 3 mm and needs to be minded at all times.
The minimum distance between parts carrying AC voltage and any switches or breakers that are not connected
to the AC (secondary parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissible
when using original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly
obeyed. This applies also to any regulations about the work place itself.
8. All instructions concerning the handling of MOS - circuits have to be observed.
Electro-Voice®
SbA750 User Manual
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Table of Contents
0 Introduction.............................................................................................................................................................. 1
Unpacking and Warranty ............................................................................................................................... 1
Setup and Connections ................................................................................................................................. 1
1 Quick Start ............................................................................................................................................................... 2
2 Controls ................................................................................................................................................................... 3
Input L/Mono Input R ..................................................................................................................................... 3
Parallel Outputs L/R ....................................................................................................................................... 3
Mid-High Outputs L/R .................................................................................................................................... 3
Level .............................................................................................................................................................. 3
Status Indicators ............................................................................................................................................ 4
Power Switch ................................................................................................................................................. 4
AC Fuse ........................................................................................................................................................ 4
AC Connector ................................................................................................................................................ 4
3 Cabling .................................................................................................................................................................... 5
4 Setup Example A ..................................................................................................................................................... 6
5 Setup Example B ..................................................................................................................................................... 7
6 Setup Example C..................................................................................................................................................... 8
7 Setup Example D..................................................................................................................................................... 9
8 Setup Example E ................................................................................................................................................... 10
9 Specifications ......................................................................................................................................................... 11
10 Dimensions ........................................................................................................................................................... 11
11 Block Diagram ..................................................................................................................................................... 12
Electro-Voice®
SbA750 User Manual
TOC
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0. Introduction
Congratulations! In buying an Electro-Voice® SbA750 you decided on getting one of todays most ad-
vanced active subwoofers incorporating sophisticated technology.
The active 15" subwoofer SbA750 with integrated 750 watt power amplifier has been specially designed to
provide fundamental bass support for professional full-range and multi-channel cabinets. Through the
integrated electronic frequency crossover of the SbA750 setting up an active stereo multi-channel system
is truly simple. The stereo audio signals for the mid-high range cabinets are provided via the MID-HIGH
outputs on the SbA750. Additionally provided are all connection facilities for using the SbA750 as active
mono subwoofer in active 2-way or add-on operation. Manufactured from baltic birch and housing a highperformance Electro-Voice
and operation. While input connection is also possible via phone type jacks, all input and output signals are
output via professional XLR-type connectors. The integrated High-Efficiency 750W power amplifier optimally matches the DL15Y woofer offering highest dynamic and audio performance and ensures at the
same time that the DL15Y woofer is always operated in its optimum operation range. Extensive protection
circuitry like VCP, DC/HF-protection, audio limiter, Back-EMF protection and thermal protection are employed to securely monitor the compliance to these operation limits guaranteeing that the SbA750 provides
outstanding performance even under most demanding conditions. The SbA750 is also especially suitable
for many rental applications. Compared to Class-AB-operated amps and because of utilizing Class-H HighEfficiency technology the power amplifier produces significantly less power loss, and additionally reduces
thermal stress of all components. Employing fans to ensure thermal stability is not necessary because of
the Class-H technology and use of comprehensively dimensioned cooling profiles. The enclosure is sealed
with extremely durable Futura coating and a robust powder-coated steel grille provides protection for the
Electro-Voice® DL15Y woofer against mechanical damage. All controls and the cooling profiles of the power
amp module are recessed to provide optimum protection for the sensitive parts of the SbA750 even during
transportation. Two carrying handles, four castors and an integrated threaded pole-mount stand flange
allow comfortable transportation and optimum, space saving installation. Because of its versatility, the
SbA750 can be easily integrated into any existing sound reinforcement installation.
®
DL15Y woofer, the SbA750 withstands even the hardest strain during transport
Unpacking and Warranty
Open the packing and carefully take out the SbA750. Remove the protective foil from the carrying handles.
A power cord and the warranty card are supplied in addition to this owners manual. Please make sure that
all details are filled in on the warranty card. Only a completely filled in warranty certificate entitles you to
stake any warranty claims. Therefore, keep the original invoice together with the warranty certificate at a
safe place.
Setup and Connections
Place the SbA750 on an even ground if possibly by using the supplied rubber feet to ensure safe operation. Make sure to check the stability of the system when using pole-mount stands. Do not cover the heat
sink on the subwoofers rear during operation. Otherwise, the SbA750 will enter protection mode because
of thermal overload. Although this provides reliable protection for the subwoofer, sound reproduction is
muted until the normal operation mode is regained. AC power is supplied via the Neutriks professional
PowerCon connector system and by use of an 15 (5m) AC cord. This ensures an absolute secure and
reliable power supply connection. However, with large installations consisting of several active cabinets, the
use of high-quality AC distributors that allow high power consumption and offer reliable protection throughout the entire system is strongly recommended.
Before establishing the AC connection for the first time, make sure that the SbA750s operation
voltage setting, which can be found on a label next to the AC switch, corresponds to your local
AC voltage.
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SbA750 User Manual
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1. Quick Start
Caution: Before switching on the power of the SbA750 always set the LEVEL control to its
counterclockwise stop. A playing sound source could otherwise lead to extreme
output levels.
This Quick Start Manual outlines the set up and operation of a SbA750 used as add-on subwoofer together
with a Powermixer (see configuration examples). The operation procedures are equivalent for other
mixers.
1. Set up your Powermixer system as usual and connect a signal source to the power mixer (e.g. CD
Player or microphone).
2. Place your SbA750 somewhere between your full-range cabinets.
3. Set the SbA750s LEVEL control to its counterclockwise stop and connect the unit to a wall outlet using
the supplied PowerCon mains cord.
4. Use a stereo phone plug cable to connect the Powermixers MONO OUT to the SbA750s L/MONO
INPUT.
5. Move the Mixer MONO OUT fader all the way down.
6. Be sure to switch on the Mixer first and then the SbA750.
Switching on the SbA750 last is recommended. Otherwise, unwanted power-on noise might occur.
When switching off your equipment, please proceed in the opposite order, i.e. switch off the
SbA750 first.
7. Set the SbA750s LEVEL control to its center position (0dB) and start the playback of the desired signal
audio source.
8. After adjusting the desired acoustic output level of the full-range cabinets using the Powermixers master
fader, establish volume setting for the subwoofer using the MONO OUT fader.
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2. Controls
Input L/Mono, Input R
Electronically balanced inputs for the connection of highlevel signal sources such as mixers, signal
processors, etc. Establishing the connection is possible via
phone or XLR-type jacks. Balanced connection
is recommended to prevent noise or HF-interference.
Caution: Before connecting or disconnecting any plugs,
make sure to set the level control to its counterclockwise
stop, which prevents the system, the audience and yourself
from being stressed by nasty contact noise.
The input section of the SbA750 also allows mono sub
operation. The stereo signal is fed to the L and R inputs
and the low-frequency range signals of both channels are
summed prior to being processed in the power amplifier
section. All other applications use only the (L)/Mono input.
Please also refer to the chapter SETUP EXAMPLES.
Parallel Outputs L/R
Parallel connected to the main inputs these sockets are
used for carrying through the input signals.
Mid-High Outputs L/R
The input signal is split via the integrated electronic crossover (PowerMax, 100Hz). Low-frequency signals
are routed to the internal power amplifier of the SbA750
while high-frequency signals are present at the Mid-High
outputs for further distribution to external power amps or
active mid-high range cabinets.
Level
This control sets the output volume of the SbA750 in a
range between -∞dB and +10dB. The internal power
amplifier provides a nominal input sensitivity of +6dBu.
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SbA750 User Manual
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Status Indicators
These indicators provide information about the actual operational state of
the SbA750s internal power amplifier.
Signal Indicates that an audio signal is present at the input and that it is
output.
Limit When lit this indicator signals that the internal power amplifier actually operated at the threshold of clipping. Short-term blinking is not critical,
because the amps audio limiter keeps distortion under control, so that the
sound is unaffected. Input overdrive, which results in sound degradation, is
a probable cause for a continuously lit indicator. To prevent this from
happening, reduce the input level.
VCP Lights when the power amplifiers Voice-Coil-Protection is activated.
During dynamic peaks the integrated power amplifier is capable of producing output levels that exceed its stated nominal output capacity. Therefore,
the SbA750 employs a VCP circuit (Voice-Coil-Protection), which simulates
the thermal behavior of the speakers voice-coil, automatically reducing the
energy fed to the speaker system on the occurrence of thermal overload.
Protect Lights when one of the multiple comprehensive protections, e.g.
against thermal overload, HF, DC or Back-EMF of the power amplifier is
activated. Preventing the woofer from being damaged, it is shutoff via
relays in the protect mode. Additionally, the input level is being reduced.
During power-on the PROTECT LED lights for approximately 2 seconds,
which is normal. This only indicates that all protection circuitry has been
activated properly.
Power Switch
AC switch for switching the SbA750s power ON or OFF. The switch lights after turning
the power ON. Make sure that the AC cord is correctly connected if the switch is not lit
upon turning the power on. If the AC cord is correctly connected and the AC switch does
not light upon power-on, please contact your local dealer.
AC Fuse
During normal operation the AC fuse of the SbA750 only blows at the occurrence of a
malfunction. Exchanging the fuse is only permissible using a fuse of the same type
(current, voltage and release characteristic). In case the fuse blows frequently, please
contact your local dealer.
AC Connector
AC connection is established via a PowerCon connector. A 15 (5m) long AC cord with
PowerCon plug is supplied.
CAUTION: THIS APPLIANCE HAS NO USER-SERVICABLE PARTS INSIDE. LEAVE ANY
SERVICING AND MAINTENANCE QUALIFIED SERVICE TECHNICIANS ONLY.
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SbA750 User Manual
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3. Cabling
LF-Cords
Using balanced cables with phone or XLR-type plugs for connecting signal sources to the SbA750 is
strongly recommended to prevent problems caused by noise interference. Make sure to mind the
pin-assignment as shown below.
2, SIGNAL +
XLR MALE
3, SIGNAL -
XLR FEMALE
SIGNAL +
2, SIGNAL +3, SIGNAL -
SIGNAL -
SIGNAL +
The following illustration shows the most important cable connections and their pin-assignment.
A balanced wiring is to be preferred in each case.
Standard XLR-Cable
signal +
signal -
Cable connection phone to XLR-type, unbalanced
signal +
signal -
Cable connection phone to XLR-type, balanced
signal +
signal -
Standard phone-type, unbalanced
signal +
signal -
Standard phone-type, balanced
signal +
5
signal -
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SbA750 User Manual
Page 9
4. Setup Example A
Add-On Operation
The easiest way to expand your power mixer by means of a SbA750.
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SbA750 User Manual
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5. Setup Example B
Stereo 2-way Active Operation with Mono Subwoofer
In this operation mode only the Mid/High signals are fed to the fullrange speaker cabinets, which allows
higher acoustic output levels.
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SbA750 User Manual
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6. Setup Example C
Stereo 2-way Active Operation with Stereo Subwoofer
The second SbA750 provides improved SPL in the bass range, in a full Stereo Setup.
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SbA750 User Manual
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7. Setup Example D
Stereo 2-way Active PA-System
Using two SbA750s to expand an existing fullrange-system, in a full Stereo Setup.
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SbA750 User Manual
Page 13
8. Setup Example E
PA-system with Active Components
SbA750 in combination with the SxA250, or other active cabinets.
SxA 250
SxA 250
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SbA750 User Manual
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Page 14
9. Specifications
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10. Dimensions
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Electro-Voice®
SbA750 User Manual
Page 15
11. Block Diagram
Electro-Voice®
SbA750 User Manual
12
Page 16
U.S.A. and Canada:
For customer orders, contact the Customer Service department at:
800/392-3497 Fax: 800/955-6831
For warranty repair or service information, contact the Service Repair Department at:
800/685-2606
For technical assistance, contact Technical Support at:
866/78-AUDIO
Specifications subject to change without notice.
All Other International Locations:
952-884-4051 Fax: 952-736-4212
www.electrovoice.com
Printed in U.S.A
© Telex Communications, Inc. 3/2003
Part Number 38110-235 Rev A
l Telex Communications, Inc. l www.telex.com
Electro-Voice®
SbA750 User Manual
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